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@jecel over on retrocomputing forum has just posted a writeup of his 8 bit CPU design - and associated computer design - which he put together in response to a challenge on G+ back in 2013.
It's an 8 bit machine, 12 registers, relatively regular but not CISC, and the kicker is that addresses are 24 bits (and the registers come in sets of 3)
See here:
Retro8 - what would have been the ultimate 8 bit micro?It's a squeeze, but Jecel has assigned a 40 pin pinout too - and also a 28 pin pinout!